RFR: 8296504: Memory leak in G1PLABAllocator::PLABData

[Man Cao]

Hi all,

Could anyone review this fix for a memory leak identified by colleague Justin King (jcking at google.com) using LeakSanitizer?
I'm sponsoring Justin for this change.

-Man

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Commit messages:
 - Fix memory leak in G1PLABAllocator

Changes: https://git.openjdk.org/jdk/pull/11032/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11032&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296504
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11032.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11032/head:pull/11032

PR: https://git.openjdk.org/jdk/pull/11032